CN103884989A - Coulombic-efficiency detection method used for SOC estimation of power cell - Google Patents
Coulombic-efficiency detection method used for SOC estimation of power cell Download PDFInfo
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- CN103884989A CN103884989A CN201210560947.9A CN201210560947A CN103884989A CN 103884989 A CN103884989 A CN 103884989A CN 201210560947 A CN201210560947 A CN 201210560947A CN 103884989 A CN103884989 A CN 103884989A
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Abstract
Disclosed is a coulombic-efficiency detection method used for SOC (state of charge) estimation of a power cell. The method includes the following steps: using a specific temperature in a work temperature range of the cell as a test temperature and performing all steps at the temperature; adjusting the SOC of the cell into 100% and discharging the cell completely under the SOC and then charging the cell to the SOC and recording the discharging quantity Qdis and the charging quantity Qcha of the cell and then calculating a coulombic efficiency Eta=Qdis/Qcha under the SOC; lowering the SOC for a preset SOC and performing a coulombic-efficiency test every time the SOC is lowered until the SOC is reduced to 0; and obtaining coulombic-efficiency values under different SOCs. The advantages of the coulombic-efficiency detection method used for the SOC estimation of the power cell are that effects that the coulombic efficiency of the cell changes with temperature and SOC are taken into consideration and when an ampere-hour integral method is used to estimate the SOC, the coulombic-efficiency values under different states are input through an interpolation table so that accumulated errors are eliminated and estimation precision of the SOC is improved.
Description
Technical field
The invention belongs to power battery technology field, be specifically related to a kind of coulomb efficiency detection method for electrokinetic cell SOC estimation.
Background technology
Electrokinetic cell is energy-storage travelling wave tube the most frequently used in all kinds of electric automobiles, the performance of battery plays conclusive effect to the performance of car load, in order to ensure the execution of cell safety and integrated vehicle control tactics, the exploitation of battery management system is particularly important, and it directly has influence on battery life and vehicle performance.Battery charge state (SOC) is one of most important parameter of battery management system, it has reflected the number of battery dump energy, rationally utilize battery, guarantee cell safety, improve battery, improve utilization rate of electrical, extend automobile continual mileage, SOC must be controlled in a rational scope.The accuracy of SOC estimation is most important, and for both at home and abroad, the estimation of SOC is a difficult point at present.
Ampere-hour integral method is the most frequently used SOC evaluation method of current batteries of electric automobile, and its principle is to estimate SOC by the integration of load current, is simple and easy to use, and algorithm is stable, and formula is as follows:
SOC in formula
0for initial SOC, C
afor battery active volume, η is a coulomb efficiency.Can find out that by above formula the accurate calculating of coulomb efficiency directly affects the computational accuracy of ampere-hour integral method.
Prior art, when with ampere-hour integral method estimation SOC, generally all adopts single coulomb efficiency value, does not consider the variable effect of battery coulomb efficiency with temperature and SOC, causes like this cumulative errors increasing, affects the estimation precision of SOC.
Summary of the invention
The object of the invention is to solve prior art and do not take into full account the variable effect of coulomb efficiency with temperature and SOC, a kind of battery coulomb efficiency detection method for SOC estimation is provided, consider environment temperature, the impact of SOC on coulomb efficiency, the coulomb efficiency value obtaining according to test under different condition is set up a coulomb efficiency interpolation table, improves SOC estimation precision for ampere-hour integral method.
For achieving the above object, the battery coulomb efficiency detection method that the present invention proposes, comprises the steps:
Step 1: select a certain temperature in battery operated temperature range as preset temperature, following steps are all carried out under this preset temperature;
Step 2: the state-of-charge of battery is adjusted into 100%;
Step 3: the battery under this state-of-charge is discharged, and then charges to this state-of-charge, record battery discharge electric weight Q
diswith charge capacity Q
cha, under this state-of-charge, the computing formula of coulomb efficiency is η=Q
dis/ Q
cha;
Step 4: battery charge state is lowered to default state-of-charge, and state-of-charge of every downward carries out step 3 one time, until state-of-charge reduces to 0, calculates the coulomb efficiency under different state-of-charges.
Above-mentioned battery coulomb efficiency detection method, preset temperature in step 1 is-20 DEG C ~ 60 DEG C, further be preferably-10 DEG C, 0 DEG C, 10 DEG C, 20 DEG C, 30 DEG C, 40 DEG C, 50 DEG C, being consistent of the electric current of the battery discharge in step 3 and charging current, the default state-of-charge in step 4 is 10%.
Battery coulomb efficiency detection method for SOC estimation provided by the invention, has taken into full account the variation of battery coulomb efficiency under different operating temperature, different SOC, has set up SOC-coulomb efficiency interpolation table under different temperatures.Compared with prior art, outstanding advantages of the present invention is to have considered the variation of battery coulomb efficiency with temperature and SOC, in the time utilizing ampere-hour integral method estimation SOC, input the coulomb efficiency value under different conditions by interpolation table, eliminated cumulative errors, improved like this estimation precision of SOC.And this detection method is simple, can be applicable.
Brief description of the drawings
The present invention above-mentioned and/or additional aspect and advantage will become from the following description of the accompanying drawings of embodiments obviously and easily and understand, wherein:
Fig. 1 is according to the FB(flow block) of the battery coulomb efficiency detection method for state-of-charge estimation of the embodiment of the present invention.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Be exemplary below by the embodiment being described with reference to the drawings, only for explaining the present invention, and can not be interpreted as limitation of the present invention.
With reference to description and accompanying drawing below, these and other aspects of embodiments of the invention will be known.In these descriptions and accompanying drawing, specifically disclose some specific implementations in embodiments of the invention, represent some modes of the principle of implementing embodiments of the invention, but should be appreciated that the scope of embodiments of the invention is not limited.On the contrary, embodiments of the invention comprise all changes, amendment and the equivalent within the scope of spirit and the intension that falls into additional claims.
Below with reference to Fig. 1, the battery coulomb efficiency detection method for state-of-charge estimation according to the embodiment of the present invention is described.
As shown in Figure 1, the battery coulomb efficiency detection method for state-of-charge estimation that the embodiment of the present invention provides, comprises the steps:
Step 1, using a certain temperature in battery operated temperature range as probe temperature, institute all carries out in steps under this probe temperature.
According to the description of this step, battery testing temperature is a certain temperature in its operating temperature range of determining, in one embodiment of the invention, this temperature can be-20 DEG C ~ 60 DEG C, is further preferably-10 DEG C, 0 DEG C, 10 DEG C, 20 DEG C, 30 DEG C, 40 DEG C, 50 DEG C.This step is to complete under same temperature in order to ensure test, considers the impact of different temperatures on coulomb efficiency simultaneously.
According to the description of this step, the state-of-charge of battery is adjusted into 100%, be full power state.
In one embodiment of the invention, carry out under identical conditions in order to ensure battery discharge and charging, battery discharge current and charging current are consistent.
Step 4, lowers default state-of-charge by battery charge state, and state-of-charge of every downward carries out step 3 one time, until state-of-charge reduces to 0, calculates the coulomb efficiency under different state-of-charges.
In one embodiment of the invention, default state-of-charge can be 10%.According to the description of this step, need the coulomb efficiency of test battery 90%, 80%, 70%, 60%, 50%, 40%, 30%, 20%, under 10%SOC, concrete method of testing is described as step 3.For example SOC is adjusted to after 50%SOC, battery is first discharged, and then with identical current charges to 50%SOC, record battery discharge electric weight Q
diswith charge capacity Q
cha.Under 50%SOC, the computing formula of coulomb efficiency is η=Q
dis/ Q
cha.Coulomb efficiency changes along with the variation of SOC, and this step takes into full account the variation of the lower coulomb efficiency of different SOC, can improve the computational accuracy of coulomb efficiency.
Step 5, according to the coulomb efficiency value under different state-of-charges, is based upon the coulomb efficiency interpolation table under this probe temperature.
According to the description of this step, under a certain probe temperature, set up SOC-coulomb efficiency interpolation table.In one embodiment of the invention, set up 100%, 90%, 80%, 70%, 60%, 50%, 40%, 30%, 20%, the lower coulomb efficiency of 10%SOC respective value one by one.According to the result of calculation under different temperatures, set up respectively SOC-coulomb efficiency interpolation table at this temperature simultaneously.In one embodiment of the invention, set up respectively battery 7 interpolation tables of SOC-coulomb efficiency at-10 DEG C, 0 DEG C, 10 DEG C, 20 DEG C, 30 DEG C, 40 DEG C, 50 DEG C.By considering the variation of battery coulomb efficiency with temperature and SOC, in the time utilizing ampere-hour integral method estimation SOC, input corresponding coulomb efficiency value according to current state by interpolation table, eliminate cumulative errors, improve the estimation precision of SOC.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, amendment, replacement and modification to these embodiment, scope of the present invention is by claims and be equal to and limit.
Claims (5)
1. for a coulomb efficiency detection method for electrokinetic cell SOC estimation, it is characterized in that, comprise the steps:
Step 1: select a certain temperature in battery operated temperature range as preset temperature, following steps are all carried out under this preset temperature;
Step 2: the state-of-charge of battery is adjusted into 100%;
Step 3: the battery under this state-of-charge is discharged, and then charges to this state-of-charge, record battery discharge electric weight Q
diswith charge capacity Q
cha, under this state-of-charge, the computing formula of coulomb efficiency is η=Q
dis/ Q
cha;
Step 4: battery charge state is lowered to default state-of-charge, and state-of-charge of every downward carries out step 3 one time, until state-of-charge reduces to 0, calculates the coulomb efficiency under different state-of-charges.
2. the coulomb efficiency detection method for electrokinetic cell SOC estimation according to claim 1, is characterized in that: the preset temperature in described step 1 is-20 DEG C ~ 60 DEG C.
3. the coulomb efficiency detection method for electrokinetic cell SOC estimation according to claim 2, is characterized in that: the preset temperature in described step 1 is preferably-10 DEG C, 0 DEG C, 10 DEG C, 20 DEG C, 30 DEG C, 40 DEG C, 50 DEG C.
4. the coulomb efficiency detection method for electrokinetic cell SOC estimation according to claim 1, is characterized in that: the electric current of the battery discharge in described step 3 and the electric current of charging are consistent.
5. the coulomb efficiency detection method for electrokinetic cell SOC estimation according to claim 1, is characterized in that: the default state-of-charge in described step 4 is 10%.
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Cited By (3)
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| CN104698389A (en) * | 2015-03-16 | 2015-06-10 | 绍兴安卡汽车配件有限公司 | Detection method of lithium battery energy efficiency |
| CN106291378A (en) * | 2016-08-15 | 2017-01-04 | 金龙联合汽车工业（苏州）有限公司 | A kind of measuring method of electric automobile power battery SOH |
| CN105738821B (en) * | 2016-02-05 | 2018-12-25 | 惠州市蓝微新源技术有限公司 | The accurate method for calculating battery coulombic efficiency under different temperatures |
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